28327777 has 4 divisors (see below), whose sum is σ = 28350916. Its totient is φ = 28304640.

The previous prime is 28327757. The next prime is 28327787. The reversal of 28327777 is 77772382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13512976 + 14814801 = 3676^2 + 3849^2 .

It is a cyclic number.

It is not a de Polignac number, because 28327777 - 2¹¹ = 28325729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28327757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9624 + ... + 12217.

It is an arithmetic number, because the mean of its divisors is an integer number (7087729).

Almost surely, 2^28327777 is an apocalyptic number.

It is an amenable number.

28327777 is a deficient number, since it is larger than the sum of its proper divisors (23139).

28327777 is a wasteful number, since it uses less digits than its factorization.

28327777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23138.

The product of its digits is 230496, while the sum is 43.

The square root of 28327777 is about 5322.3845219976. The cubic root of 28327777 is about 304.8392129325.

It can be divided in two parts, 2832 and 7777, that added together give a square (10609 = 103²).

The spelling of 28327777 in words is "twenty-eight million, three hundred twenty-seven thousand, seven hundred seventy-seven".